restructure file folder

comp90015_assignment2.iml

+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file

DrawingArea.java → src/client/DrawingArea.java

+package client;
+
 import javax.imageio.ImageIO;
 import javax.swing.*;
 import java.awt.*;

PaintGUI.java → src/client/PaintGUI.java

+package client;
+
 import javax.swing.*;
 import java.awt.*;
 import java.awt.event.ActionEvent;